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GRE Prep Club Legend  Joined: 07 Jun 2014
Posts: 4857
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
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Kudos [?]: 1856 , given: 397

If x is odd, all EXCEPT which one of the following must be o [#permalink]
Expert's post 00:00

Question Stats: 62% (01:25) correct 37% (00:22) wrong based on 16 sessions
If x is odd, all EXCEPT which one of the following must be odd?

(A) $$x^2 + 4x + 6$$
(B) $$x^3 + 5x + 3$$
(C) $$x^4 + 6x + 7$$
(D) $$x^5 + 7x + 1$$
(E) $$x^6 + 8x + 4$$
[Reveal] Spoiler: OA

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Sandy
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Intern Joined: 10 Aug 2018
Posts: 29
Followers: 1

Kudos [?]: 6 , given: 2

Re: If x is odd, all EXCEPT which one of the following must be o [#permalink]
Please explain how the answer is C?
GRE Prep Club Legend  Joined: 07 Jun 2014
Posts: 4857
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
Followers: 112

Kudos [?]: 1856 , given: 397

Re: If x is odd, all EXCEPT which one of the following must be o [#permalink]
Expert's post
Explanation

For even and odd questions, you can either think it out logically or plug in a number. Since one choice requires raising the number to the 6th power, pick something small! Plug in x = 1:

(A) $$x^2 + 4x + 6 = 1 + 4 + 6 = 11$$
(B) $$x^3 + 5x + 3 = 1 + 5 + 3 = 9$$
(C) $$x^4 + 6x + 7 = 1 + 6 + 7 = 14$$
(D) $$x^5 + 7x + 1 = 1 + 7 + 1 = 9$$
(E) $$x^6 + 8x + 4 = 1 + 8 + 4 = 13$$
_________________

Sandy
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Try our free Online GRE Test Re: If x is odd, all EXCEPT which one of the following must be o   [#permalink] 01 Sep 2018, 15:08
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